Drilling mechanism



T. R. E. RUNDQvlsT 1,862,497

DRILLING MECHANISM Qriginal Filed March l5, 1924 4 Sheets-Sheet l June 7, 1932.

June 7', 1932. T. R. E. RUNDQvlsT 1,862,497

DRILLING- MECHANISM original Filed March 13, 1924 4 sheets-Sheet 2 mm I' June 7, 1932. T. R. E. RUNDQvlsT 1,862,497

DRILLING MECHANISM Original Filed March 13. 1924 4 Sheets-Sheet 5 'gy' n f* f n u n r June 7, 1932. r. R. E. RUNDQvIsT 1,862,497

DRILLING. MEGHANISM Original Filed March 13 1924' 4 Sheets-Sheet 4 vation.

Patented June 7, 193,2l

UNITED STATI-:s

Trione n. E.

aUNDovIsr or oLAnni/ron'r, NEw'nAMrsHrRE, AssrGNon To sULLIvANv MACHINERY coMrANrAconronArroN, or' MASSACHUSETTS DRILLING 'MECANISM Applicationled March 13, '1924, Serial No. 699,109. V Renewed September 15, 1930.

This invention relates to drilling mecha-u nlsms.

It has for its object to provide an improved drilling mechanism.` Another object` is to provide an improved automatic drilling mechanism. A further object is to provide a drilling mechanism'of the drifter type having feeding mechanism therefor a'nd provided with improved means for automatically reversing said feeding means when the operation of the drilling mechanism is not normal, one example of which is when resistance to rotation of the drill steel becomes too great. A further object is to provide improved `means for automatically reversing the drill when the same has reached the end of its forward str'oke. Still another object is to provide improved means which cooperates with a part of the automaltic stop means to blow out the hole at the will of the operator. Another obiect is'to provide improved means for blowing out the hole at the will of the operator without aifecting the operation of the feeding mechanism. -Another object is to provide improved automatic means whichy is responsive to the normal operation of the hamnier piston to control a pneumatic feed therefor.

In the accompanying drawings I have shown for purposes of illustration several forms whih my inventionmay assume in practice; Y

In these drawings- Y 1V I Fig. 1 a developed 'longitudinal vertical section of my invention parts being shown in elevation.

Figa 2'is a vertical transverse line'2-'2 of Fig. 1.`

Fig. 3 is -a vertical transverse section on line 3-3 of Fig. 1,-parts being shown in elesection A on Fig. 4 is a long g'itudinall section through the controlling valve which is transversely disposed to the machine and is taken online 4-4 ofFig.'3. Y Figs. 5 to are transverse .sections through .the controlling valve taken on lines 5-5to 13-13 Vof Fig. 4 respectively. Y

vFig'. 14 is a. vertical transverse section on line 14-14 of Fig. 1 with the drilling mechanism in its rearmost position rather than in its forward position as shown in Fig. 1 and also on line 144714 of Fig.15.

Fig. 15 is a fragmentary side elevation of Fig. 1li-corresponding to a view looked at from the opposite side of themachine shown in Fig..1.

Fig. 16 is an enlarged detail of the valve mechanism forautomatically stopping and reversing the drilling motor upon reaching its forward liniit of movement.

Fig. 17 is an 'enlarged sectional view of the manually'hoperable means for cleaning the hole by air pressure, the view being taken substantially on line l-l'? of Fig. 3.

Fig. 18 'is a transverse section. taken on line 18-18 of Fig. 1 of the pawl and ratchet mechanism for` assisting in steel rotation.

`Fig. 19 is an enlarged detail of a modied .y form of automatic forward stop for the drill.

Fi 20.v is a still further modification of the automatic stop. Y

.Fig 21-is a longitudinal section through a modified form of automatic feed controlling pilot valve.l A

Fig. 22 is a section on line 22-22 of Fig. 21.V In the illustrative form of my invention I have"v shown the same embodied withinV a drifter type of drill having a pneumatic feed cylinder 1 used as asupporting shell while projecting downwardly therefrom is a 4usual supporting member 2 which may be mounted on any suit 4ble support and projecting` up; wardly from the cylinder .1 are longitudinal grooved' guides 3 extending substantially the full length of the feed cylinder.. customary the drilling mechanism, generally indicated at 4,.is slidably mounted in the guideways. therein which, as vclearly shown in Flg. 3,

transmitted t0 a hollow .steel 10 carried in `a. chuck sleeve 11 rotatedby a` striking bar, 100% 3 as"v by having gibs 5 disposed' are'disposed somewhat below the under s ideA uding ajcylinder 6 hav Y Y 9 partiallyfrotated 'on alternate strokes` thereof, such partial rotation being'AY 12 having straight grooves on the periphery thereof to cooperate with a chuck nut 13. A usual type of fluid distribution valve 14 is employed which lcooperates with forward and rearward passages 15 and 16 each of which forms an inlet and exhaust passage for the opposite ends of the motor cylinder. There are also employed usual piston controlled throw ports 17 leading from opposite ends of the motor cylinder 6 to the valve 14 for controlling' actuation of the valve 14. Carried in the rear head 18 of the motorl cylinder is a usual main valve.19 adapted tocontrol fluid ilow to the motor 4 and to the feeding cylinder 1 by means hereafter described. The head 18 also carries hole cleansing iluid conducting tubes 2O one of which terminates within the striking bar 12 and the other within a hollow portion of the steel 10, while fluid is. supplied thereto as by a suitable connection 21. l'

The particular structure employed for feeding the drilling mechanism, which includes valve mechanism and passages lfor auctomatically controlling the feed, comprises a rearwardly extending U-shapedl arm 22 clearly shown in Figs. 1 to 3 formed on the head 18 and terminating at its rearward end in a downwardly projecting member 23 which has a conical shaped bore 24 in axial alinement with the cylinder 1. Disposed within and projecting forwardly frm the bore 24 fis a plug member 25 held therein by a nut 26 while threadedly connected thereto -at its forward end is a hollow piston rod 27 carrying a piston 28 at its forward end which is held thereto by any suitable construction such as avfianged plug 29 threaded into theV forward hollow portion of the rod 27 to ca use the several elements of said piston 28, which includes suitable packing, to be thrust into tight engagement Aagainst a flange 30. Also carried in the plug 25'is a forwardly\ extending fluid conducting tube 3l coaxially disposed with respect to the cylinder and rod 27 and terminating in a head 32iixed within the forward portion of the bore of the rod 27, the4 sa-me being made leak proof. From the construction thus far described it will be seen that the drilling mechanism when moved back and forth in the guideways 3 will also caiise movement of the piston 28 vin drilling a hole the drilling mechanism will be moved to its rearmost position, a relatively -short' steel inserted, and the drilling mechanism ythen fed forward to its forward limit. If it is now desired to drill a deeper hole, obviously it would require a steel of greater length, and the machine is then again brought to its rearmost position and the short steel moved forward into the hole. The drilling mechanism is then swung laterally in order to remove the short steel. f The longer steel then inserted into the hole to a depth so that\the shank will clear the forward end of the chuck housing, after which the drilling mechanism yis swung to its normal position. The steel may then be pulled back into the chuck which will then be rotated .tobe fed forward a. distance substantially equal to the feeding length of the cylinder 1. Such an operation may be repeated as often as desired to deepen the hole. To permit this lateral movement, the guideways 3 terminate as at 33 slightly in advance of the rearmost portion of the cylinder 1 while positioned adjacent the endI of one of these guideways, is a member 34 having an arcuate` groove 35 formed therein, thecenter of transverse curvature of this groove coinciding with the axis of the feeding cylinder. The distance between the end of the guideways 33 and the rear head 36 through which the piston rod 27 projects is slightly greater than the length of the piston 28. Hence when said piston is in its rearmost position the gibs 5 are of such length that they will be freedfrom their guideways and the drilling mechanism may then be swung to its lateral position, being guidedduring such movement by an arcuate lug 37 mounted on the. forward end of the drilling mechanism substantially adjacent the end of the chuck housing and adapted to have slidable engagement with the groove 35. The mechanism is preventedy frqm having lateral movement in the other direction by a suitable extension 37 a of the lower portion of one of the guideways 3 against which said lug 37 will.

abut. It will be noted that during the lateral swinging of the mechanism to the dotted line position shown in Fig. 14 the piston rod .27 willact as a supporting pivot.

An opening 38 is formed in the lug 37 to allow passage therethrough of a suitable lug or stopmember l39 formed on the 'upper side of the cylinder 1, the function of which will appear later.

J In order to accomplish the automatic fea! ture of cutting oil the forward feed and causing actuation of the reverse feed whenthe operation of the drilling mechanism is `not normal, such for instance as when the steel becomes stuck or when resistance to rotation thereto becomes too great, I have provided suitable valves and passage means for controlling the flow of fluid to opposite sides of the' piston 28. This means includes the main control valve 19 comprising a conical sleeve \40 non-rotatably seatediwithinthe conical bore of the valve housing 41 and held therein by' any suitable means such as a nut 42. Rotatably mounted within 'the sleeve 40 is a main conical shapedvalcve 43adapted to seat withina cpnical bore in the sleeve 40"'and rotated by a suitable lever 44. Reciprocably mounted within a"bore.45 formed in the valve V member 43 is a spring pressed pilot valve 46. Communicating with a chamber 47 formed in the member 43 is a usual inlet conduit 48 from which luidwill ow to chamber 47 and put through ports 49, 50 i n the valve member 43 o and sleeve 4 0, respectively, to a suitable pas# sage leading to inltof the distributing valve 14.A These ports are further shown in Figs. 12fand 13, the upper views ofwhich are in closedposition and the lower in open position. The pilot i valve 46 hasf suitable annular e grooves which connect certain passages leading from a source of live pressure fluid and to the forward and rear sides'of the piston 28. The valve 46 when inf the position. shown in zo Fifg, 4 ,is fin normal forward feeding position, theisame being held in that position by a spring .51. Said valve is also subjected k to ,the prefssure fluctuations within the opposite ends of the motor cylinder '4" as by a assage 52 leading from the passage`16 l(see ig-l 1) to the groove 53 iormed n the outer periphery of the sleeve through a port 54 to recess 55 (seeFig. 1 1), and through port '56 to the inner end of the valve 46, while com- 80 municating with thepassage 15 is a' passage 57 adapted to conduct fluid to the rear ofithe f' 'valve 46 as by a port 58 (Fig. 5) formed inf] vthe sleeve 4l), groove 59 formed in the pe riphery of the valve member 43, andpbrtd ,35 leading therefrom to the end of said valve.

Thus upon reciproeation of the piston, .the pressure uctuations within the motor cylinderl will pass through .the passages 52 and 57 to both .ends of said valve but as these ,40 iuctuations occur very ra idly there is mainel tained a ubstantiallyzcolistant pressure'at both endsv of the va'lve 46' which will not cause a iintteri'ng movement ofthe valve 46. The steadiness of said valve is assistedby the 45 spring 51.l Suitable passages are provided for conducting fluid from a source of live 'luid supply to .th e rear side of the piston 28 which comprises grooves. 61, 62 in the peripheryofthe nsleeve 40 (Fig.- 12') portl 63, ^groov`e 64 ormed'in the 'periphery of the valvenechanism 43 and ports 65 vor-66 t0.'

an annular groove 6 -ormed in the, periphery of the pilot valve 46.`` The .groove -67- communicates' with a chamber' 68 (seeVFig. 8)

formed by cutting a vertical Jslot in the" outer portion of\the valve member 43 and with a port 69 leading to a passage 70,' prt 71 formed in the member 25, (Fig. 1),' liollpw portion of the piston rod 27 Iand po'rt 72 formed in the forwardportion of the piston rod to the` rear side o f the piston 28 .which will cause said piston to move forwardly and by' allowmorm'al pgessure to bebuilt feed-the drilling mechanism therewith. During the flow of Huid throughthe pas- `sagesiust melitioned the 'cylinder ein front to drive the (saine rearwardly.

of the piston'28 is vented to theatmosphere as by having a port 73 formed in the valve housing 41 and which communicates with a port 74 formed in the sleeve 40 (Fig. 7), groove 75 formed in the periphery o the valve member 43, port 76, annular groove 77 formed in the periphery of the pilot valve 46,

`ports 78 and 79 '(see Fig. 6), longitudinal groove 80 andpassage 81 (Fig. 1) which leads to a chamber 82 formed in the rear portion of the member 25-fro1h which the conducting tubegil communicates to allow a flow/pf fluid fromz'dr to the front side' of thvegpiston 28 as by a bore-83 formed in the piston retaining nut 29.

If now, for any reason, tion of the drilling mechanism should becomeincomplete for instance if the resistance to steel rotation should become too great the piston A 9 would he prevented from completi ing its rearward stroke, which is the direction of movement upon which the steel is rotated, and the pressure on the rear side of.

said piston will be exhausted to atmosphere as vthrough tlie valve 14. Thekvalve 14 will also relieve the pressure in the passage 52 and the ports and passages cor1neote l."cher'e` ,with which lead to the front side of the pilot` valve 46. Live pressure iiuid will, however,

Stili be admitted .t6 the from side of the piston 9 and as a result normal working or live presssure might be maintained in the passage 57 and the passages and ports communicating t erewith whichdead to the rear.

side of the pilo valve 46 so that the pressure the mode-of peraon the rear end ofthe valve 46 will force the same 1n a right hand direction against the tension of the spring 51, the result being that port 68 is cut oil? bythe annular ring 85, thereby preventing further flow ito the rear side of the-piston 2 8 through the passage 70,

:and upon lmovement of the ring 85. to the right vhand side of the port 68, passage 70 will be vented to atmosphere as by the annular 'groove 77 which will communicate-with port 73. At this instant, the vent for the forward side ofthe piston28 willkbe' closed asby 'a shoulder 86 riding' over the port 79. Live -fluid pressure at the same time is admitted to the reverse passage '81 and consequently 'to the-forward( side of the piston 28 This latter function is accomplished due to the fact that 'annulargrooves67 will now allow communication between the live air port 63 and a port 87 formed in ythe valve member 43 which communicates withr-the port 88 and a pas lio sage 80 through passage 81 to the front'side of thepiston 28. As-soon as the steel :is

suiciently re both-ends thereof to transmit egual pressures leased' or becomes free, the pis-1 ton 9-wil1 assume normal operation and there; up at to the endsof valve 46, whereby thespring 51 17A will again force the valve over to its normal forward feeding position. Upon first turning the valve 43 to ope position, it will be seen thatthe device, due to the normal position of the valve 46, would feed forwardly until the steel engaged the material to be drilled. It isoftentimes desired to spot a hole before allowing a full forward feed and to do this, I have provided a trigger lever 90 pivotally mounted upon the lever 44 and adapted to actuate a stem 91 coaxially disposed within the stem of the valve member 43 to push the valve 46 forwardly so that it might vent the forward feed and throw on the reverse feed. lIn the operation of this part of the device it is seen that should the levers and 44 be squeezed together, the device would reverse and when the lever 90 was released, it would immediately feed forward. Thus by alternately compressing and releasing the lever 90, the drilling mechanism can be first fed forward and thenrearward rwithin a relatively short distance so as to hold it in substantially one position adapted for spotting.v I also find that a satisfactory operation can -be had ify the operator will merely place his finger at 'some predetermined position as designated by a dotted circle 91jJ in F ig; 4 and hold the same there throughout the spotting operation so that when the main valve is turned on and the machine fed forward, lever 90 will engage the operators finger and thus reverse the mechanism until sufficient reverse movement has been attained to allow the pilot valve 46 to again throw in the forward feed which will thereby cause the lever 90 to again be fed forward against the operators finger. It is found in actual practice that the total reverse and forward movement of the mechani'smis very minute so as to present practically a stationary drill for spotting. I have also found that a mechanical finger longitudinally movably supported on some stationary part of the mechanism can be used so that-by?, placing said finger at any longitudinal posltion, the same operf'ating effect can be had as just described.

It is often desirable to clean out the hole being drilled by `supplementinggthe usual hole cleansing fluid with live actuating pressure from the motor cylinder, and toaccomplish such a function, I hold by suitable means, the piston 9 in its rearward position Aso that live fluid in front of the piston can then flow down through the, flutes formed in the periphery of the striking bar 12 to the steel. It is to be noted, however, that in the ordinary operation ofthe piston 9, ifthe same vbecomes held on its rearward stroke,

. the normal operating 'pressure 'on the rear side of the piston will exhaust to relieve pressure on the front end of the pilot valve 46 while pressure on the'front. side of the piston will be maintained at normal and throw the pilot valve 46 to the right, thus causing reverse feeding movement. It will thus be seen that to holdvthe iston 9 in order to blow out the hole an still maintain the steel within the hole some means must be provided for preventing reverse feeding of the drilling motor. To hold, at the will of the opera-tor, the piston 9 in its rearward position to affect the blowing feature, it is necessary to hold the valve 14 at one end of its travel. To accomplish this, I provide means adapted to cut off flow from the reverse throw port 17 leading to the front end of the cylinder 6.

This meanscomprises a-manually oper--` able spring pressed valve 92 reciprocably gmounted within a bore 93 formed in the rear the pilot valve 46. However, to allow thev normal flow of fluid through said passage, an annular groove 94 is formed in the valve l92. A sp-ring pressed fluid pressure actuated plunger 95 is reciprocably mounted` within reduced and enlarged bores 96 and 97 as shown in Fig. 17. Upon forward movement of the plunger 95, the throw port 17 will be cut off from communication with the forward part .of the cylinder 6 and thereby prevent live pressure fluid from flowing to one end of the valve 14, thus causingthe latter to be held which prevents live pressure fluid to be distributed to the rear side of the piston 9 to force the same forward. To actuate the plunger 95- the bore 97 communicates with the bore 93 below the lower end of the valve92, when in the position shown in Fig. 17, as by a passage 98.. It is to be noted that the passages 57 and 98 which lead into the bore 93 are dis osed close together so that upon downward) movement of the valve 92 the annular groove 94 will allow communicapassage 57 leading from the bore 93, thus preventing the flow of live ressure fluid through port 58to the rear si e of the pilot y valve 46 and thereby the forwaid feed is continued.` The flowof fluid from the front end of the cylinder is diverted as through the annular groove 94, passage 98 and the bore 97 to aotuate a piston 99 formed on the rear end of the plunger 95 to thrust the same forwardly and thus close the throw port 17. When it is desired to assume normal operation, the valve 92 will be released and the spring 100 thereunder will force the same outwardly.

When the drilling mechanism reaches its forward feeding limit, suitable means come into operation for automatically 1cutting out the forward feed and throwing on the reverse feed so as to withdraw the' Steel and thereby warn the operator, who may be running several such machines, that a lresetting of the Y steel is necessary as previously explained. This means comprises a spring pressed valve 105 reciprocably mounted in bore 106 formed in the lower side of the head 18, said bore being closed as by a vented plug 107 as shown in Figs. 1 and 16. During the forward feed Vthe valve 105 will assume av position in the forward end vof the bore 106 but upon the drill reaching its forward limit, a stem 108 projecting forwardly from the valve 105 will engage the stop member 39 mounted upon the cylinder 1 and cause said valve to be thrown in its/rearward position as shown in Fig. 16 thereby allowing live fluid pressure to be admitted to the bore 97 to thrust the plunger' forwardly and shut oli' the` throw' port 17 y which will,- as previously explairied, cause the piston 9 to be held in a rearward position.

I This means comprises a passage 11,0 leading .fromaany suitable source of live pressure lluid Y such Vas the main control valve to an annular groove 111 formed in the periphery "of the valve105, ports 112 and 113 to theJinner end of the bore 106 from which it will pass through passage 114 to bore 100 below valve 92 from which it passes to passage 98 to actu-A .ate the plunger head 99. i lt will be noted that the passages 57 leading to and from the bore 93 are not interrupted as in the manual operation of the valve 92. The resultis that pressure on the rear side of the piston 9 being exhausted, relieves the pressure on the front side of the pilot valve46 while the normal pressure on the "front side of the piston 9 will be communicated through the passage 57 to the rear side of pilot valve 46 to cause the same to be thrown forwardly and thereby actuatefthe reverse feed as previously eX- V4plained. During such operation it will also` be noted that the hole will be cleaned due to the pressure Huid in the front end of the cylinder 6 ,discharging through the flutes the rifle bar. Upon 'this reverse movementkthe stem 108 will move away from stop 39 but Such movement will not aectlthe position of valve due to live pressure fluid acting on its forward side, the area of whichl is great enough to overcome the pressure of the spring 2115 dispos'edin the rear of said valve. The machine isvfernsequently fed'to its rearmost position. To re-start the machine is necessary to close the main eontrolValve or to interrupt the flow-of live pressure through port whereby the valve 105 will then be alf lowed to assume its front position andto open the throw.. ports '17'so that the valve 14 mayl assume its normaloperation. f r

rn rig; 19 I have Shawna `moarfied farm of means for shutting olf the forward feed upon the drilling mechanism reaching its forward feeding limit, which comprises a: springpressed., plunger 120 reciprocably iunted within a bore 121 formed in a bushing .122

ywhich takes. the place of 'the partition 32 shown in Figi 1,"and in which the tube 31 terminates. Projecting 'forwardly from Athe piston 120 and through a nut 123, which takes the place of the nut 29 shownvinv Fig..1, is a stem 124 adapted to engage the front end 125 of the feed cylinder, the nut 123 havingrlm a port 126 which takes the place of the bore 83 in tha nut 29. Theobjectof theva'lve`120 is to permit equalization of the pressure on both sides of thepiston 28 and 'due t0 the dilferene in area of said sides, the piston when subjected to. equal pressureslwill be fed in a reversedirectionA To accomplish this, a passage 127 is formed througholt the length of the. valve 120 with which radially extending ports 128 communicate while rearwardly spaced from said ports is an annular groove 129 communicating with radial ports 130. l/Vhen the stem 124 engages the head.

125 and is pressed rearwardly against the tension f ,the spring 131J groove 129 will register with port 132 formed in the member V122, thus permitting fluid on the rear side of the piston 28 t'o pass through ports 72, 132,

passage 127 to' the vfront 1side of the piston 28 which due to its larger' area will thus cause the piston to be moved slightly backward until the stem 124 disengages the head 125 vto thereby shut off the port 132. U on disengagement of the stem 124 from t e head 125, the pressure on the forward side of the piston will be exhausted out th'rOu-gh'the tube 31 and the piston will again be fed forward.lr

The amount` of travel of the piston to equalize the pressure and exhaust the same fromv the front side of the piston is very simallso that the drilling mechanism assumes ypractically a stationary position. J ln Fig. 20 I have shqwn howthe same result may be accomplished by a somewhat,

and thus prevent further forward movement I pf the piston 28.

'It is not thought that further description X of the mode of operation of the var1ous elements 1s necessary in View of the operation as brought out in connection with each feature.

It is to be noted, however, thatl I have prbvided an automatic drilling mechanism whichan operator needs on^lyto set up and /thereafterpay practically 119 attention'tlrereto, for ifthe mode of operation-of the drilling motor or `steel should become incomplete the machine will autmatically beY pulled out untiwill automatically be'fed back andheld. In addition to these novelfeaturegl, have also r rmal running resumed when the mechanism will ber" again fed forward and l, upon reaching its forward limit of movement,

A combined therewith suitable hole cleansing means.

In Figs. 21 and 22 I have shown a modified form of automatic feed controlled pilot valve which in some respects is similar to my preferred form. The operation of this valve differs from the other one in that upon initial operation ,of the drilling motor, said valve is moved to automatically shut off a reverse feed and to throw on the forward feed, whereas in my preferred form upon initial operation of the dri-lling motor the pilot valve is held stationary to allow the forward feed to operate and is thrown only when the motor stops so as to cut out the forward feed and throwv in the reverse feed. More specifically, this valve comprises the usual sleeve 40 xed within the housing 41 and within which is rotatably mounted the conical shaped main control-valve 43. Formed inthe valve 43 is a bore 140 having a pilot valve 141 reciprocably mounted therein and held at the forward end ofthe bore 140 when the drilling motor is not running as by the spring 142. When in this position, when 'the valve 43 is turned to on position, live fluid pressure will flow from the supply hose 48 to" the front side of the feed piston 28 to impart reverse movement thereto as by a passage 143, annular groove 144 formed in theh eriphery of the valve 141, ports 145 and 146 ormed in the valve 143-and sleeve 41, and terminating in the passage 81 leading to lthe conducting )tube 31 disposed in the hollow' piston rod 27. The rear side of the piston 28 is vented to the atmosphere as the passage and annular groove 147 b al'so formed in the periphery of the valve 141 and ports 148. and 149 formed in the valve member 43 and sleeve 40 respectively. y It will thus be seen that with the valve 141 in its forward position the reverse feed will be actuated. However, when the drilling motor has normal operation, pressure fluctuations in the rear' end of the cylinder, are communicated to the front end jof the bore 140 to throw valve 141 to a rear position whereby the port 146 is shut ofl" from communication with the live fiuid pressure admitted through passage 143 and at the same time vents the passage 81 which is the reverse feed passage as by a passage 1 50, a port 151, the annular groove 147 and ports 148 and 149. The ressure fluctuations are `transmitted to the ront end of the bore 140 as by a passage 153, a

`port'154, a groove 155 'and a port 156, all of reverse and orWard fee will be automatically shut off and thrown on respectively. The valve is held in substantially a stationary rear position, as the pressure fluctuations in the rear end of the cylinder occur so rapidly that the tension of the spring 142 is not sufficient to immediately thrust the pilot valve to its forward reverse position. However, should the operation of the motor become hindered 1n any manner such as to prevent reciprocat1on of the hammer piston, which might be by the steel sticking, the fluid in the rear end of the/cylinder will be exhausted to atmosphere thereby relieving Ipressure on the pilot valve to allow the same to be thrown forwardly to control the forward and reverse feeds as above stated. A stem 159 projects rearwardly from the valve 141 and is adapted x to be engaged by the stem 91 for the spottingoperation as explained in connection with my preferred form.

While I have in this application specifically described several forms which my invention may assume in practice, it will be understood'that these forms of the same are shown for purposes of illustration and that the inventionmay be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims. Y

What I claim as new and desire to secure by Letters Patent'is:

1. A drilling mechanism comprising a pressure fluid actuated drilling motor, feeding means therefor, a main valve for controlling said motor, and a fluid actuated valve .carried in said main valve' for automatically valve for controlling sai'dmotor, and pressure fluid operated controlling means including a pressure fluid actuated valvecarried in said main valve for automatically controlling said feeding means, 'saidlatter control valve having a pressure fluid operating connection with said motor.

3. A drillingV mechanism comprising a pressure fluid actuated drillingmotor having pressure-variations therein during operation thereof, feeding means therefor, a main valve for controlling said motor, and pressure fluid operated controlling means including a control valve carried in said main valve for automatically controlling said feeding means, and pressure fluid operating connections between the .opposite ends of said latter control valve and said motor.

v4. A vdrilling mechanism comprising a pressure fluid actuated drilling motor having pressure variations therein during-operation thereof, feeding means for saidmotor, and pressure fluid operated controlling means for said feeding means controlled by said motor natalie? '7 A'including a pilot valve, anda pressureiiuid.

operating connection between the opposite y ends of said valve and said motor.

5. A drilling mechanism comprising' a Y pressureJ fluid 1actuated drilling motor yhaving pressurevariations therein during operation thereof, feeding means for said motor, and ressure fluid operated-controllin means for said feed-ing means controlledY y said motor including a pressure fluid "actuated pilot-valve, and a pressure fluid operating connection between the opposite ends of said valve and said motor. y 6. A drilling mechanism comprising apressure-fluid actuated drilling motor having pressure variations therein -`during"operation thereof and including a cylinder and/a' piston movable therein, feeding "means for said motor, and pressure Huid operated controlling means for said feeding means controlled by saidmotor including a pressure fluid actuated pilot valve, and-pressure fluid' operating connections between the opposite ends of said Pvalve and the opposite ends of said cylinder.

7. drilling mechanism comprising a pressurefluid actuated drilling motor having van automatic fluid distribution valve, actuating means for said vvalve including valve A throwing passagesga hollow drill steel actuated by said motor, hole cleansing means Acooperating with said steel, and means .for controlling said cleansing means including a fluid actuated controlling valve associated with said fluid distribution valve for controlling one of said valve throwingpa'ssages.

8. AV drilling Amechanism comprising a pressurefluid actuated drillin4 motor having an automatic fluid distri ution valve, actuating means for said valve including valve throwing passages, a hollow drill steel actuated by said motor, hole cleansin means cooperating with said steel, means or controlling said cleansing means -including a fluidsactuated controlling valve associated with said :duid distribution 6valve for controlling one of said valve throwing passages, and` a manually oper-able valve for controlling operation of said valve. '9.1 A drilling mechanism compr' ing a pressure fluid actuated drilling moto having an atmatic fluid distribution valve, valve throwing` ports controlling Asaid valve, hole cleansing means cooperatingswith said moqtor, and means includinga fluid actuatedQvalve forcontrolling Huid flow tliroughone of said' valve throwing ports.

A10. A drilling mechanism comprising a pressure fluid actuated drilling motor having an automatic fluid distribution valve, valve -throwing ports *controlling Asaid valve, lfhole controlling fluid flow through one vof said valve throwing ports, anda manually operlatter valve.

11. A drilling mechanisnr comprising a' drilling motor, a hollow drill steel actuated thereby, feeding means therefor, hole cleansm ingmeans cooperating with said steel, and' means operative upon a predetermined'eeding movement of said feeding means for controlling said hole cleansing means, said hole cleansing means includin meansoperable at the will of the operator or controlling said cleansing means.

125A drilling mechanism comprising, a drilling motor, a hollow drill steel actuated thereby, feeding means therefor, hole cleansmf ing means cooperating with said steel, and means controlled byisaid feeding means for controlling said hole cleansing means. 'i

13. A drilling mecahnism comprisingF a drilling motoria hollow v drill steel actuated matically controlling said feeding means'm@ said automatic means including means for controlling said hole cleansing means.

15. A Fdrilling mehanism comprising a drilling motor, a drill :steel actuated thereby, feeding` means. for said steel, hole :leansing means cooperating with said steel, nd means operable upon a predetermined feeding movementof said feeding means for automatically. controllingfsaid; feeding means,

said automatic controlling means/including n@ means for controlling jsaid hole cleansing means and for controlling-said motor. l

16. A drillingl mechanism comprisingia drillingmotor, hole cleansing means cooperating therewith, means for positively/,feedlng said motpr forwardly and rearwardly,

and means operative upon eig/predetermined forward feedinga movement ofv said feeding means for vauto aticzlly controlling said reverse feedin tomatic controlling means also including means for controlling said-hole` cleansing means. I

17. A drilling mechanism comprising a' dri-lling motor, hole` cleansing means cooper- 125 ating therewith, vmeans for-v positively feed- `ing said motorl forwardly and rearwardly,

and means operative upon a. predetermined forward feedlng movement of said feeding means fdr automatically controllingsaid remeans, said auverse feeding meansand said motor, said automatic controlling means also including means for controlling said hole cleansing means. A I

18. -A drilling mechanism comprising a hollow drillsteel, feeding means therefor, hole ,cleansing means cooperating with said drill steel, and means operable upon a predetermined feeding movement of said feeding means for automatically effecting 4operation of said hole cleansing means.

19. A drilling mechanism comprising a hollow drill-steel, feeding means therefor, hole cleansing-.means cooperating with said drill steel, means operable upon a predetermined feeding movement of said feeding means for automatically effecting operation of said hole cleansing means, and manual operating means for said holecleansing means cooperating with said automatic means.

20. A drilling mechanism comprising a hollow drill steel, feeding means therefor, hole cleansing means cooperating with said drill steel, means operable upon a predetermined feeding movement of said feeding means for automatically effecting operation of said hole cleansing mea-ns, and manual operating means for controlling said hole cleansing means, said manual operating means cooperating with said automatic means and being operable at the will of the operator and `wholly independently of said feeding means. v i n a y 21. A drilling mechanism comprising a drilling motor having a throttle valve and of the reciprocatory type, a drill steel actuated thereby, lfeeding means therefor, pressure fluid operated means automatically controlled by pressure changes in said motor caused by load changes on said motor for controlling-said feeding means, and-means operable independently of throttle valve y movement for controlling said motor while said feeding means continues to normally operate.

22. A drilling mechanism comprising a drilling motor of the reciprocatory'type, a

drillsteel actuated thereby, feeding means therefor, pressure fluid operated .means automatically controlled by pressure changes in said motor caused by load changes on said motor for controlling said feedingmeans; and means associated with said automatic controlling means for'controlling said motor while said feeding means continues to normally'operate. I

l23. 'Af drilling mecahnism comprising 'a drilling motor. having a throttle valve and of the reciprocato'ry type, a drill steel actuated thereby, feeding means therefor, ressure uid o rated means lautomatical y -controlled y pressure changes in said motor caused by load changes on said motor for controlling said feeding means, and means operable independently of throttle valve movefor controllin ment and at the will of the operator for controlling said motor While said feeding means continues to normally operate.

24. A drilling mechanism comprising a drilling motor having a throttle valve and of the reciprocatory type, a drill steel actuated thereby, reverse and forward positive feeding means therefor, means automatically controlled by load changes on said motor for controlling both of said feeding means, and means operable independently of throttle valve movement and at the will of the operator for controlling said motor While said feeding means continues to normally operate.

25. A drilling mechanism comprising a drilling motor of the reciprocatorytype having operator adjustable control means, a drill steel actuated thereby, forward and reverse positive feeding means therefor, means automatioally controlled by load changes on said moto'r for reversing said feeding means, and means separate from said motor control means for controlling said motor while said feeding means continues to normally operate.

26'. A drilling mechanism comprisin a drilling motor having a' fluid actuated tribution valve for controlling the fluid distribution thereto, a drill steel actuated by said motor, feeding means' therefor, pressure fluid operated means automatically controlled by pressure changes in said motor caused byv load changes on said motor for controlling said feedingM means, and means said distribution valve for controlling said motor While said feed-ing means continues to normally operate.

27. A drilling mechanism comprising a drilling motor having a throttle valve and of the hammer type, a drill steel actuated thereby, feeding means therefor,rotation means forjsaid steel, pressure fluid operated means automatically controlled by pressure changes in said motor -caused by resistance to rotation for controlling said feeding means, and means operable independently ofV throttle valve movement for controlling said rotation means while said feeding means continues to normally operate.

28. A drilling .mechanism comprising a drilling motoriiaving a cylinder, a drill steel actuated by said. motor, said motor including a reciprocating piston, a iuid distribution valve, and throwing ports for said valve communicating with said cylinder and controlled by said piston, pressure fluid operated means automatically controlled by load changes on said motor-.for controlling said feeding means, and means controlled by said feeding means and cooperating with one of said throwing ports to control said valve for controlling said motor While said feeding Ameans continues to normally operate.

29. A drilling mechanism 'comprising a motor, means for feeding said motor, and pressure fluid operated means for automatically stopping the operation of said motor when said feeding means has fed said motor a predetermineddistance including a plurality of cooperating fluid controlling valves.v

30. A drilling mechanism comprising a pressure fluid actuated motor having pressure changes therein during operation thereof, means .for feeding said motor, and presm sure fluid operated means for automatically stopping the operation of said motor when said feeding means has fed said motor a predetermined distance inluding a plurality of cooperating iiuid controllingvalves one of l5 which is automatically controlledby pressure changes in said motor. x

31. A drilling mechanism comprising amo-l tor, means for feeding saidy motor, pressure Huid operated means for automatically stoppin the operation of said motor when said fee ing means has fed said motor a predetermined, distance including a plurality of' cooperating fluid controlling valves, and stationa'ry abutment means wlth which 'one of said valves is engageable.

32. A drilling mechanism comprising a Y pressure fluid actuated motor having pressure changes therein during operation thereof, means for feeding said motor, pressure fluid a0 operated means for automatically stopping the operation of saidmotor when said feeding means has fed said motor a predetermined distance including a plurality of cooperatin controlling valves, the operation of one o whichis controlled by pressure c changes in said motor and by said other valve.

33. A drilling mechanism comprisiig a. uid

pressure fluid actuated motor having a distribution valve for controlling the dis- 40 tribution of pressure fluid thereto, feeding means for said motor, and means :for controlling said feeding means including means for automatically controlling said distribution valve to control the d illm motor when said feeding meanshas fed sai vmotor a predetermined distance. J -1 34. A drilling mechanism comprising a pressure fluid actuated drillingV motor ofthe impact type including a cylindgr', a piston 5 reclprecable therein, there being pressure variations in said c lindery at the oppositeends of said piston uring operation of said v motor, a drill steel actuated by saidmotor, feeding means therefor, rotation means for said steel, and pressure luidoperated means' automatically controlled by resistance to drillsteel rotation for controlling saidv feeding means, said automaticcontrolling -means having ajplurality ofoperative fluid connections with the ends of said cylinder.4 f ,Y 35.- A drilling mechanism comprissing a pressureluid actuated drilling motorV of the impacttype including a cylinder, a piston reciprocableltherein, there being pressure Avariati'onsin said cylinder at thecopposite ends of -said piston during operation of said motor, a drill steel actuated by said motor, feeding means therefor, rotation means for said steel, and pressure iuid operated means automatically controlled by load changes on said motor for controlling said feeding means,

said automatic controlling means having a plurality of operative fluid connections with of one of which being dependentl upon the operation of another.

37; A drilling mechanism comprising a drilling motor, a drill steel actuated thereby, feeding means therefor, rotation lmea-ns for said steel, means automatically controlled by resistance to drill steel rotation for controlling said feeding means, and means automatically operative upon a predetermined feeding movement of said'feeding means' for affecting operation of said automatic means to effect its controlling function.

38. A drilling mechanism comprising a pressure iluid actuated motor of the reciprocatory type having pressure variations therein during operation thereof, a4 drill steel actuated by said motor, feeding means therefor,

ing pressure variations therein durin oper-f atlon thereof, feeding means for sai work performing means, and presslrre fluid operated means automatically'con olled by load changes on said motor for controlling said feeding means, said automatic means having a plurality of pressure fluid connections with sald motor. y l

40. A drilling mechanism comprisin apressure fluid operated drilling motor, a. rill steel actuated thereby, feedin means for said steel, rotation means,for sai steel, pressure uid operated means automatically controlled by pressure changes in said drilling motor caused by resistance to drill steel rotation for controlling said feeding means, and means operative upon a 'predetermined feeding movement of said feeding means for controlling said Ifeeding meansl wholly independr ently of said rotation means. v Y

41.. A drilling mechanism comprising a .drilling motor, a drill steel actuated thereby,"l

rotation means for said steel, and pressure .10V

feeding means for said steel, rotation means for said steel, means automatically controlled by resistance to drill steel rotation for controlling said feeding means, and'means asso,

, ciated with said automatic controlling means ually operable means for normally controlvling said motor and feeding means, pressure -iiuid operated'means automaticallycontrolled Y therein durin operation thereof, and` a pispleniental pressure by pressure changes'in said motor` caused by resistance to drill steel rotation for controlling said feeding means, and supplemental means cooperating with said automatic controlling means and operable at the will -of the operator for controlling said feeding means and motor.

43. A` drilling mechanism comprising a fluid actuated drilling motor comprising a cylinder having pressure variations therein during operation thereof and including a Areciprocable piston, a drill steel actuated thereby, rotation means for said steel comprising a ratchet and pawl mechanism cooperating with saidpiston, feeding means for said steel, and pressure Huid operated means automatically n controlled by resistance to drill steel rotation for controlling said feeding means, said automaticcontrolling means having a plurality of operative fluid connections with said motor at the opposite ends of said cylinder. Y

44. A drilling mechanism i comprising a pressure fluid actuated drilling motor comprising azcylinder having pressure variations ton lreciproca le in said cylinder, pressure fluid actuated feeding means therefor, a main valve for controlling `both said motor and feeding means, and a supplemental pressure fluidV operated controlling means including a feed .controlling valve having a plurality of-operative pressure fluid connections with said motor at the opposite ends of said cylinder, vsaid latter valve being dependent upon theoperation of said main valve.

45; A drilling mechanism comprising a pressure'uid'. actuated drilling motor com- `prisin a cylinder having pressure variations t erein .during operation thereof, and a piston reciprocable in said cylinder, pres.- sureluid actuated feeding means for said motor, a' main valvefor controlling both said motor and feedin means, and a supuid operated controlhng 'means including a feed control- 1i? valve arranged within said main valve an having a plurality of operative pressure fluid connections with said motor at the opposite ends of said cylinder, saidlatter valve I eing dependent upon the operation of said main valve.

46. A drilling mechanism comprising a pressure fluid actuated drilling motor having pressure variations therein during operation thereof, a drill steel actuated thereby, rotation means for said steel, pressure iuid actuated feeding means for said motor and itively feeding said steel forwardly and rearwardly, and means comprising but a single controlling member and said controlling member being automatically controlled by resistance to drill steel rotation for reversing said feeding means.

48. In a drilling mechanism, a pressure Huid actuated drilling motor comprising a.

cylinder having a bore, a piston reciprocable in said bore and Huid distribution meansfor effecting reciprocation of said piston, feeding means for said motor, and bmeans for automatically controlling said feeding means including but a single fluid actuated controlling member and passage means communicating with said cylinder bore for controlling said controlling member.

49.' In a drilling mechanism, a pressure fluid actuated percussive drilling4 motor comprising a cylinder having a bore, a piston reciprocable in said bore and fluid distribution means for effecting reciprocation of said piston, pressure fluid operated feeding means for said motor, and means for automatically controlling the iow of pressure fluid to said feeding means including but a single fluid actuated. controlling memberv and' passage means communicating with `said' cylinder bore for controlling said controlling member.

50. In a drilling mechanism, a pressureiuid actuated drilling motor comprising a cylinder having a bore, a `piston reciprocable in said bore and fluid distribution means for effecting reciprocation of said piston, pressure fluid actuated feeding means for said motor, and means for automatically controlling the iow of pressure fluid to said feedin means comprising but a single fluid actuated controlling member and passage means comf municating with saidcylinder bore for subjecting a portion of said member to the pressure in said motor.

5f. In a drilling mechanism, a pressure fluid actuated drilling-motor having a throttlevalve and comprising a cylinder having a Lesa-iai bore, a piston in said bore and fluid distribution means for effecting reciprocation of said piston, feeding means for said motor, and means including a fluid actuated feed control member controlled by the pressure in l saiddrilling motor for automatically controlling said feeding means to vary the oplno eration of the latter, and means operable independently of throttle valve movement and at the will of the operator for controlling said motor while said feedingmeans continues normally to operate.

52.1 In a drilling mechanism, a pressure fluid actuated drilling motor having a throttle valve and comprising a cylinder having a bore, a piston reciprocable in said bore and fluid distribution means for effecting reciprocation of said piston, feeding means for said motor, means including a fluid actuated feed control member controlled s by the pressure in said drilling motor for automatically controlling said feeding means to vary the operation thereof, and means operable independently of throttle valve movement for stppaping said drilling motor while said feedlng means continues normally to operate.

53. In a drilling mechanism, a pressure uid actuated drilling motor comprlslng a cylinder having a bore, a piston reclprocable in said bore and Huid distribution means for effecting reciprocation of said iston includinga fluid distribution valve, eedin means for saidfinotor, means including a uid acl tuated feed control member controlled by the pressure in said drillin motor for automatically controlling said ceding means'to vary the operation'thereof, and means for controlling said valve to control said drilling motor without adecting the operation of said feeding means.

54. ln a drilling mechanism, a pressure fluid actuated drilling motor comprising a cylinder having a bore,apiston reciprocable in said bore'and iluiddistribution means for effecting reciprocation of said piston, feeding means for said motor, means for automaticallycontrolling said feeding means in- ;'cluding a, pilot valve and passage means communicatin with said cylinder bore for subjecting said pilot valve tothe pressure in said motor, amd means cboperating with said `ingmeans when the l valve for automatically'stoppin said feedatter has fc5 said motor a predetermined distance.

55. In'- .a drilling mechanism, a pressure fluidl actuated drilling motorcomprisinga cylinder havinga bore, a piston reciprocable in said bore and iuid distribution means for effecting reciprocation of saidl piston, feeding means for 'said motor, means including ya fluid actuated feed control member controlled by thepressure in said motor for automatically controlling said feedin means to vary the operation thereof, means or controlling said niotor while said feeding means operating with a part of said latter means for controlling said feeding means.

56. In a drilling mechanism, a pressure fluidl actuated drilling motor comprisin a cylinder having a bore, 'a piston reciproca le in said bore and Huid distribution means for effecting reciprocation of said piston, feeding means for said motor, means including a fluid actuated feed control member controlled by the pressure in said motor for automatically controlling said feeding-'means to vary the operation thereof, means for controlling said motor while said feeding means continues normally to operate, and means cooperating with a part of said latter means for controlling said feeding means after the latter has fedsaid motor a predetermined distanc 57.\In :a drilling mechanism, a pressure fluid actuated drilling motor comprisin -a cylinder having a bore, a piston reciproca le in said bore and fluid distribution means for effecting reci rocation of said piston, a drill steel actuat by said piston, feeding means for said drill steel, means including a fluid actuated feed control member controlled by the pressure in the said motor for automatically controlling said feeding meansto vary the operation thereof, hole cleansing means cooperating with said drill steel, means for controlling said motor while said feeding means continues normally to operate, said latter means including means for controlling said cleansing means Ato cleanse -the drill hole, and means coo erating with a part of said -latter means or controlling said feeding means. t ,l

58. In a drilling mechanism, a pressure fluid actuated drilling motor comprising a cylinder having a bore, in said bore and fluid-distribution means for ceffecting reciprocation of said piston, for- Ward and reverse positive feeding means for said motor, Ameans including a fluid actuated feed' control member controlled by thepresa piston reciprocable sure in said motor for "automatically con' trollingsaid feeding means to vary the operation thereof, means for controlling-said motor while said .feeding means continuesnormally to operate, and means cooperating -r ling said feeding means.4

with a part of saidv latter means forcontrolcylinder having a'bore, a piston reciprocable in said bore and fluid distribution means for effecting reciprocation ofsaid piston, mea'ls forpositively feeding said motor forwardly and rearwardly, and. means controlled by the pressure in-saidx'motor for automatically re,- versin'g said feeding means comprising but a single fluid actuated controlling membe/r, and passage means communicating with said nisl . cylinder having a bore.

cylinder bore for subjecting said controlling member to the ressure in saidmotor.

60. In a dri ling mechanism, a pressure fluid actuated drilling motor comprising a cylinder having a bore, a piston reciprocable in said' bore and fluid distribution means for effecting reciprocatio'n of said piston, forward and lreverse feeding means for said motor, andmeans for automaticallycontrolling said feedingmeans comprising but a single fluid actuated feed controlling member for simultaneously controlling both said forwagd and reverse Vfeeding means and passage means communicating with said cylinder bore for subjecting said controlling member tothe pressure in saidL motor. A

61. In .a drilling mechanism, a pressure fluid actuated drilling motor comprising a cylinder having a' bore. a piston reciprocable in said bore and fluid distribution means for eecting'reciprocation of said piston, pressure fluid'actuated feeding means for said motor, and means for automatically controlling lsaid feeding means comprising but a singlefluid actuated valve `member and passage means communicating with said cylinder bore for subjecting a portion of said valve member to' the pressure'in said motor.

'62. In a drilling mechanism, a pressure fluid actuated drilling'motorcomprising a a piston reciprocable in said .bore and fluid distribution means for effecting reciprocationof said piston, pressure fluid actuated feeding means for said motor, a inain control valve for said motor. and means for automatically controlling said feeding means including a. pressure fluid actuated valve carried 'within said main valve and passage` means communicating with said cylinder bore for subjecting said pressure fluid actuated valve to the pressure in said motor. l

63. In a drilling mechanism, a pressure fluid actuated drilling motor comprising a cylinder having abore. afpiston reciproc'able in said bore and fluid distribution means for fecting reciprcation of said piston. a pres sure fluid actuated feeding means r'for said' motor, and means for automatically control-- ling said feeding means including but a sin'- gle fluid actuated valve and passage means communicating` with said 'cylinder bore for controlling said valve.

s 64. In a drilling mechanism, a pressure fluid' actuated drilling motor. comprising a cylinder having a bore, a piston in said bore and fluid distribution; means for 'effecting actuation of said piston, feedingmeans for said motor, and means for automatically controlling said feeding means comprising but a single fluid actuated controlling member and'passage means communicating with said c linder ,bore for subjecting `said controlling member to the pressure within said N motor cylinder.

65. Inl 'a drillin mechanism, a 4pressure fluid actuated dri 'ng motor having pressure variations therein during normal operation thereof, feeding means for said motor, and means for automatically controlling said feeding means comprisin but a single fluid actuated controlling memer and means whereby said member is controlled by pressure variations in said motor during abnormal o eration thereof.

66. n a drilling mechanism, a pressure fluid actuated drilling motor having pressure variations therein which occur rapidl during normal operation of said motor, feedS ing means for said motor, and means for automatically controlling said feedin means comprising but a single control va ve and means' whereby said valve is actuated to control. said feeding means when the pressure variations in said motor become less rapid due t0 abnormal operation of said motor.

67. In a drilling mechanism, a 'pressure fluid actuated drilling motor having pressure fluctuations therein of varying intensity `within a certain limit during normal operation of said motor, feeding means for said motor, and means for automatically 'oontrolling said feeding means comprising but a single fluid actuated controlling member and means whereby said member is actuated to control said feeding means when the pressure fluctuations become of an intensity outside of said limit. v

68. In a drilling mechanism, a pressure fluid actuated drilling motor comprising a cylinder having a bore, a piston reciprocable n said bore and fluid distribution means for effecting reciprocation of said piston, pressure fluid actuated feeding means for said' motor, and means for automatically controlling the flow of pressure fluid to said feeding means including a control valve having op- `pressure areas and passages connecting the opposite ends of said cylinder bore with said pressure areas respectively.

69. In a drilling mechanism, a pressure fluid actuated drilling motor comprisin a cylinder having a bore, a piston reciproca le in said bore and fluid distribution means for effecting reci rocation of-said piston including passages eading to the opposite ends of said cylinder bore for supplying fluid t6 and exhausting fluid from the opposite ends of the cylinder bore,'pressure fluid actuated feeding means for said motor; and means for automatically controlling the flow of pressure,

fluid to said feeding means including a control valve having opposed pressure areas and passages connecting said first mentioned passages with said pressure areas respectively.

70. In a drilling mechanism, a pressure fluid actuated drilling motor, a pressure fluid actuated reversible feedng means for said motor for feedin the latter in either direction, a' main valve or controlling flow of, pressure fill fluid to said drilling motor, a valve arranged within said main valve for controlling the flow of pressure fluid to said feeding means to effect feed in either direction, and passages formed in said main valve and controlled by said second mentioned valve for conducting fluid to said reversible feeding means.

31. ln a drilling mechanism, a pressure fluid actuated drilhng motor, a pressure fluid actuated reversible feeding -means for said motor for feeding the latter ineither direcvalve for conducting fluid to said forward l and reverse feeding means respectively, and auxiliary valve means for controlling both of said passages.

7X3. ln a drilling mechanism, a motor, forward and reverse positive feeding means therefor, a main control valve for control-v said motor and said feeding means, said valve having a handle adapted to be grasped by the operator, auxiliary valve means for controlling said forward and reverse feeding means and including operating means arranged in juxtaposition to said main valve handle to enable the operator to control said auxiliary valve means and said main control valve by but a single hand without removing said hand from said main valve handle, and passages formed in said main valve and controlled by said auxiliary valve for conducting fluid to said forward and reverse feeding means respectively. 77. ln a ldrilling mechanism, a motor, for- `ward and reverse positive feeding means therefor, a main valve for controlling the flow of pressure fluid through said motor and Said feeding means, said valve having a grasping handle and means associated with said grasping handle for enabling the operator to control the flow of fluid to both' said forward and reverse feeding vmeans with but a single hand Without removing said hand from said main valve handle.

ln testimony whereof l affix my signature.

THRIE R. E. RUNDQVIST.

ling both said motor and said feeding means, 5

passages directly controlled by said main valve for conducting Huid to said forward and reverse feeding means respectively, and auxiliary valve means dependent upon the operation of said main valve for controlling both of said passages.

74. ln a drilling mechanism, a motor, forward and reverse positive feeding means therefor, a main control valve for controlling both said motor and said feeding means, auxiliary valve means cooperating with and disposed within said mai-n control valve for controlling said forward and reverse feeding means, and passages formed in said main valve andcontrolled by said auxiliary valve for conducting yfluid to said forward andV reverse feeding means respectively.

75. In a drilling mechanism, a motor, forward and reverse positive feeding means therefor, a hollow main control valvefor controlling both said motor and said feeding means, auxiliary feed controlling means including valve means reciprocably mounted in said main control valve for controlling both of said feeding means,

and passages formed in said main valve and controlled by said auxiliary valve for conducting fluidl to said forward and reverse feeding means respectively. v

76. In a drilling mechanism, a motor, forward and reverse positive feeding means therefor, a main valve for controlling both 

